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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd944ce55b3935695b84c1bfa7bb6a02d80036117a460dad8da6f4253818a54ff' 
  AND token = 'iBQWFBCMwaclyn803B/cZyqjZydIUvGAmZCBdF4qUxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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