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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c06cb5687b8eec495ff1218e79bb7ccf3a8af0325a1b71453d0ab0bc01319362' 
  AND token = 'kswDzfnHFLLb+f2Gai4v4PSKYInjAssTJCk9345rMHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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