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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d7ebc1c2be68fb74842c9e7c5e5839c36eb5cb399b0eb3abb2513d9081bd5b1' 
  AND token = '1mD5Ko22o6GGnc/6VGWy/HP0/ImCOJvq7burePZx7pA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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