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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8565fd3ec42724e7777b9714cdcb73a0f1ea69216526e66e985a22ab186b664' 
  AND token = '76uc/uQ+W4+xtKEgHIEwEkT9I/Sce0pMunapRsYh5uI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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