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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '475cc0a329e1020b6762f1faf3a97e6a27aafa606c0ad11380c195c7bb7d50c0' 
  AND token = 'aeC7GU+vYkhb6+PX/t4OkcBs/BbY+VWR/6ERjz/dbu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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