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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d52876fa8b304b4d4c26da03d8ec18bd5e0d6bb069ad56855c34944169dbdce' 
  AND token = 'KWsY8VIuZ3vlJUBDSRS2mO3pr5xLuT2zr456Fccug7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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