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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d2d7b3d1319280f93b8503a68fa09c8db82d775be94840b0ac5262a221c9cc3' 
  AND token = 'TBOJcMSb8OliDHO2vGYhdmU0dfoZ7N3cglLP54EP03w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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