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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb29aa0f63e9ae231f5611c4f0f5a9cb220c7ba5df841246b2a7e6cbe4a80698' 
  AND token = 'qQkD2NtGhsxd0cRqkFbgaNZa/zZCWCAVwYeVemQoa9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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