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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1323a0cdfd9d43a71973bf4ea7e4a06e4be8adc4b0b80c7fcba3ed53b252663' 
  AND token = 'O95ZK6YEQZjE81dS9WH5ABCIulXPiF4A/qp01wDL/lA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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