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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '657d7412e3c5a4b24b86d750430e5cd4da9d3ebf0fb4f606ee73e120bc60c90d' 
  AND token = 'zEl54yNk6ZqpWuMDwmOwGanieB9Y+tFyvdScdkzuYMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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