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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d412211123f00ba889be2ce825af8f1b8efec4f68a7f740fac6e55b9df0e752' 
  AND token = 'ytesLL22O1oBi38iTwmW+lhnKr6dN7C0XrISF/w2j/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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