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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '302ef31af7b7170b37971134da4e647b5691faedf58519e9cd409342a86d9db1' 
  AND token = 'RQPk6i0IlIJif7/M+k6ht9f3PyfZxxvobh8ED16J7f8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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