SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fd4c9b1dd7772a22911cab60875f9dd148f7eb55797642b612882b66eb820b5' 
  AND token = 'R79SJf0THK1Y+4VBBcPZQP/kU/O7GOR1AJz1uusvXvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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