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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b13399e82500ef6514d2d9507e90490fa7c7d8b59103fafe422a0605692a73e' 
  AND token = '17b1paJO0gYIbDSmEFuE9Lb7+i/ABY+zuwrKzc+8Olw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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