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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6cf6994b82fb1fcffc975cf157edde91ee9248e146726322b70ecfb81dd8642' 
  AND token = 'L4RaKPbNsvnNCjLhr4R2IJKfmOaq+92zvJMJNhwqWR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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