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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a499d79fcd7826764fa7b96ad478089e517a026db24477fe40ab3d87c25f95d' 
  AND token = 'aA/r45NPDTSG+xIjRawYN7Ff0GrH16kaecduVKSPXtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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