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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '657e2e7f69f97e0acc87b60af439bd58209cb16105323bc0b1c76d74ab58d004' 
  AND token = 'KgcdzxnDbOL+UEk6BLEWBn6Dh1xht8pducf+PZFFbLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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