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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '353e158f5ab5c459d5b56efffc4ef93a0a128901371e65ce1c938ac6b75b94e7' 
  AND token = 'BIS7Mk9GvzDeilgmmQtcnIxfR3zsCnCHXRWPOX2Yf6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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