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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45b19143d02af9d6623e5c228326b2b8ce30c4e34cf2cbca026219f1911baa5f' 
  AND token = 'Nb16J67nJSh4m7nuC1ljEPMfjiE617EJfAm+MeuRZ4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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