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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3a55e49f5dec423b69b22b4a6ee04d4ffcb8becf06e474cf1fa6b26ad904066' 
  AND token = 'V90wk7diACVtIuu60BfQj2/cUAGK06sc5SZI/f0SkiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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