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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1af79f94d1f8cbb66513cda8fde28c6b66c504f3ae5ae64226a89875f28f434a' 
  AND token = '1cctC3zDVvu513b8hvCsku43fhkxkFk9UW0N5Ef0mEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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