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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8ab3c30b264fdf638fad9870510e39af4b82e7d578673af599ff1b997c8517c' 
  AND token = 'lcKD+Px3H0DFXdjWye+Eqkua2nfRq3z32NjOad+lA9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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