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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31c2aad110cfb2c20d91ba523c955c1a1f715dd9d92da28c4a9478fe98d2e7ec' 
  AND token = 'KgMGh8LyYwuYiZQVg/1QYAiX8N52FL65KloR5QHP0Ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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