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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '852898ee24f177706ff8be027969fafb6b98edac331ac3a9db045271f2716a9b' 
  AND token = 'eZH+Me9DOnuNC59CKT+uVZHpO+v9Z6EnuZ3GLzmz2fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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