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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd09389a5cac235b2017a172e00e09f9c587e2864caa3e420495f92310b94163' 
  AND token = 'd/hZ5s7dpis2OqpCdOaJV3545hiPH10bHXhLBFgMDhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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