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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5cff1ef1692b67894ed738c4840c2929c95780d0e12b6067fef15f510e99800' 
  AND token = '4VZlZDOMbuYG9TgNMIw+NzhnKlt9KaO6+brKBeE/1KY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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