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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a430e22b1af9ea711b71501748489c351acfe1ab355b7a7c51874c60d4406dd' 
  AND token = 'imTx9gsTetmbt9ni3weq0iJPP7Ax8zYND5fcXX4KXWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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