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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '544ff6142e75bff5ec8c4ea7c1bb08ae99266783afabcc1272931674311c002e' 
  AND token = '878rQsrT3h7r7kUw6RDbRZJBwzeEXKR4jAIQjHvm02o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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