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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa9264d74ff15c7d3038de1417c05d40ce6018542d6abd16a0b3dfc92369227f' 
  AND token = 'NCyKB3LLRzG2tZCWTu82XvUenwH8gtKditnQ9O/M66g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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