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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f39bd530fb05710a1c16a85593f353f38c8870775b8963eac060ae45eed68cfe' 
  AND token = 'I9K6MNKm7XjN7lyh86eo5EvG2IX/OuOq0BNObSIMWAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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