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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '382d7e535835f5db9b9b9a4c60d875dfd7e113a4d7679349ca0a3fe31d98a599' 
  AND token = 'yLpCMT/ydp1eQVH0otkekE5+SdXHNLUWOH+p0pQ4a+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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