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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93d3ef23ce5de7cd81119109abcf0f3d191183bd40ec75629134a5f1dc3e817a' 
  AND token = '8LLDsVzpugNRGSIeuPOeQYRfC1vtM2bOvTajg6+XW9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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