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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7414ff10675d5d1ddd4708c7f590f6e297fde84cef9bba9699f4fa37b07d7b06' 
  AND token = 'rZTzTuPcrftVdlAiquJij8oIutzxhyJnUWosZK2ta4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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