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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f764bbc0cf3ed51ea7fd3efd98203445dd42c724ed35a9e26acf3d2ce5162491' 
  AND token = 'uLWs/DnHZQIFdV5gxv5UCA5gkIGoN8xJCJmLRe6eUXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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