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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5047709710196c44b8c98c3086b59495ceec28dfbecdf429e87ff68cbda4d024' 
  AND token = '/sHJqgYV6sffiGrYeLYyZLRfP23d88jfuv+UvWZNWD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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