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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee6b890a2633a1f17ab1d70eef639aa3fc1dd6521e62df3416b4a6638971e5d8' 
  AND token = '6hmW4OF37Ov9OlU2E038Cq5S/3iHeQMSNvBNFH30nOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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