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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eac7cbddd014ae9adfbc73c3a754efb9988a73744e1088c53d450cef4efdc686' 
  AND token = 'gwI4bufhB+1H8+Vla38yrGw5EoTT8jpzhJe1JOuZw4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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