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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc594925cc40c33d8c335ba181dc39ac280fa09d9674f6bb8df643ea9696d991' 
  AND token = 'zCWlQFka0uhA8uMAhIftzB+DG7ZG+Z4Ee5v8RdcahFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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