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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dae8dc4605bab7c2b9b71730e768d591e3e7de02860ecc0733d0a0e9442c99cb' 
  AND token = 'KzFJQH8Z602saYwWbq72faI7Rw/rMrCP19/PFH4/nMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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