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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6049d1824e5c5b92a86ee2e6a6329c398b4d581528ee206e3fec1a7a4bf7259e' 
  AND token = '4+pkbxl0Nx6Tv4bZNjFTFvJa21UX+e+MVRRUzSqYAgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}