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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3abe1e70e5912f5646d6a87047262b2e9268fa10a3fb2b6d11cfe8b024e9126' 
  AND token = 'l4dCPuRsIzGhe5FNH7elXhzlWjv1L76AIBTzwrePpfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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