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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d5c0f4b6a63cd8cd3246be77eeb0f1b4d24e1008071e547cac11fb8360e0ab6' 
  AND token = 'NW0MoO33kcHKKd8B9QAhtYvMKM/C+0bDjyvTS0yKxOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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