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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce4a3cf18f69945806eed19ae539d44a6dfccfb9150df3ab55cf10d8a0b19939' 
  AND token = '5Qzdbv51I32Xv8L0jVgcLkIkXnlZn07DpHIDwdAC7HU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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