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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb81db763cb3305df5ea2479bdedc3662ba3c23c2992c44d2638f2fee4964957' 
  AND token = '/s0StBl7Mt4myDvBWO9Qqnbr6YVtV9uZiBk3y0wGWxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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