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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcb5c73b8f7d0b3b96113892583dbb4d8bd90f1f03c2202b6f0e909343deb5fa' 
  AND token = 'eLM8yyeXt5MxC5hYWsQT3UzCuuOsgCNvI0tEvcGltu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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