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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81099ce67413e3c2280421363df9bb52660f0a47ccfd08434fb2189f94da3028' 
  AND token = 'uvvpYrac8MPtr+AtNXu+LXYQZIPlmojnQZS01OL0I74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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