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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4151c4afcf116734ced8d641cc933b5d7bb703d0899257a4732a938c3ce21ba3' 
  AND token = '3Gp1YyUZNAka2b0QToelfaom0MQWpYNmjBefzAW1zeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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