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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae313ac28d4e39ceed0e75d03203e1a8975543601371896c217d162ccf8a00ff' 
  AND token = 'xo4P/nwE59XJTgbD00iHbCFtWq85bb70KlH6NsPYezo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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