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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3d8028d656222fed4f2c094b68b268d1a27a3de977369dc70d466a2851c29ab' 
  AND token = 'W9TMZgCU3r5GnMCmrwfOytpRju8c2OkHwDBIXY5Scos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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