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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bc493a3c02a422aa33cdfccd34ffae7589c547eece5a33d867c0600909299aa' 
  AND token = 'fVuHj7hD3/q8dJx6xQMNs7f2FWNAvhWOuFI21oYRy80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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