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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bc35011d86e94c86f5197a1bf55261de412b576c69ef1e5ada3256dff8c4bfc' 
  AND token = 'KKb1dC7Whxbe6i5Jj6Fc1QmWX1INaYITdRe42+aW29I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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