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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '409a79b9876df9010b889af39075eb258f5b65c6942964aa2dd53753bbdeeba0' 
  AND token = 'BcMn28iBteYv0RN+aDWLw/Zg2oJQh2RHujFr13FWdRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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