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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '883448e34fc785947117745e3e2c6d652826f30b6877225bf273a235cd5914a2' 
  AND token = 'R592vCEXvns706y9ICequQczyB10OnKGP76fEEPar3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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