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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f61523019e3be911519b501887b5451faaef49c6a6875362758cd9ecca7f45a7' 
  AND token = 'yIWMaLux4rUpq63ibmcaQh17tYEhAI+eriDUa6cTxWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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