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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3955bb1ea14a84419c945eb8f0943b9c9f8ea59dff1e490276480bc492cd9a24' 
  AND token = '93XLQTgzz+yNW7UoOGfdwOihhllci1WMt2iC4xENdjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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