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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd123f451157c2e389690ff7f669805d58395ef5d33596e5fd82e5683e608988' 
  AND token = 'qKstdO4DxSmUmLaxe6c5NmZ0AkteQyfW15mB3zIiEFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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