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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '454a44649cf259b76313cc3a9d1f2409124ebbe6817261e260a190bdf4afca5d' 
  AND token = 'Uq59o7mM4RNP0d6Bus/ah9NYPu0/it6uejwmp6//lao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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